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engineering
introduction mechanical engineering

Questions and Answers of Introduction Mechanical Engineering

Slip for a reciprocating pump is defined as (a) Qa-2th 2th 2th -Qa 2th -Qa Qa-2th (b) (c) (d) Qa 2th Qa
The pump suitable for small discharge at high pressure head is(a) axial flow (b) centrifugal (c) mixed flow (d) reciprocating
Air vessels in reciprocating pump are used to(a) smoothen out flow (b) increase pump efficiency(c) increase pump head (d) reduce acceleration head
Head developed by a centrifugal pump depends upon(a) impeller diameter (b) speed (c) fluid density (d) type of casing
For starting a centrifugal pump, its delivery valve should be(a) open (b) close(c) partially open (d) any one of the above
The water in the casing of a centrifugal pump moves(a) radially (b) axially (c) tangentially (d) in a spiral
In a centrifugal pump, the liquid enters the pump at the(a) top (b) bottom (c) centre (d) sides
There shall be no flow of water from a centrifugal pump until the pressure rise in the impeller is greater than the(a) suction head (b) delivery head (c) static head (d) manometric head
The suitable pump for flood control and irrigation applications is(a) reciprocating (b) centrifugal (c) axial flow (d) mixed flow
A suitable pump for handling viscous fluid is(a) reciprocating pump (b) centrifugal pump(c) turbine pump (d) screw pump
Which one of the following is not a rotary pump?(a) gear pump (b) vane pump (c) screw pump (d) axial pump
Priming is required in a(a) gear pump (b) screw pump(c) reciprocating pump (d) centrifugal pump
For pumping molasses, it is preferable to employ(a) reciprocating pump (b) centrifugal pump(c) open impeller pump (d) rotary pump
For pumping mustard oil from a drum, a suitable pump is(a) reciprocating pump (b) vane pump(c) centrifugal pump (d) gear pump
What is a pump? What are its functions?
How do you classify the pumps?
Explain with a neat sketch, the working of a single acting piston pump.
Explain with a neat sketch, the working of a double acting piston pump.
Explain the working of a single acting plunger pump.
Define slip in a reciprocating pump.
What is the main difference between a plunger and bucket type pumps?
What is the function of air chambers in a reciprocating pump?
What is priming? Why priming is required in a centrifugal pump?
Describe self priming devices.
Explain with a neat sketch the working of a centrifugal pump.
How do you classify pumps?
How do you classify centrifugal pumps?
Explain the main features of volute type and vortex type centrifugal pumps.
Give the general classification of rotary pumps.
Describe the working of a gear pump.
What are the advantages of centrifugal pump over reciprocating pump?
Describe the working of (a) screw pump (b) vane pump (c) hydraulic jacts (d) hydraulic lift.
A double acting piston pump runs at 90 rpm. Its bore and stroke are 150 mm and 450 mm respectively. Determine the theoretical discharge in m3/h. If the total head to be lifted by the pump is 60 m,
A double acting reciprocating pump has a piston diameter of 160 mm and stroke length 350 mm.The suction and delivery heads are 5 m and 18 m respectively. The pump speed is 70 rpm and percentage slip
A single acting reciprocating pump delivers 45 m3/h of water against a total head of 25 m. The pump speed is 90 rpm. If slip is 5%, calculate (a) volume of cylinder in litres, and (b) power
A single acting reciprocating pump has its piston diameter as 150 mm and stroke 250 mm.The piston makes 50 double strokes per minute. The suction and delivery heads are 5 m and 15 m respectively.
A double acting reciprocating pump has a piston of 250 mm diameter and piston rod of 50 mm diameter, which is on one side of the piston only. Length of piston stroke is 380 mm and the speed of the
A double acting reciprocating pump delivering 80 litres per second has the following specifications :Diameter of piston = 300 mm; Stroke = 600 mm; Speed = 80 rpm; Suction head = 5 m;Delivery head =
A single cylinder, single acting pump lifts 30 litres of water per second against a static head of 25 m. The cylinder bore is 350 mm and stroke is 450 mm. Determine the speed of pump if slip is 2
A single acting reciprocating pump has to deliver water against a total head of 50 m. The plunger diameter is 120 mm. What is the force exerted by the plunger during delivery stroke? Assume pump
Water is raised to a height of 40 m by means of a centrifugal pump. If the quantity of water raised is 350 m3/h, determine the power of electric motor required to drive the pump. Take efficiency of
A centrifugal pump lifts water against a static head of 30 m of which suction lift is 3 m. The loss of head in suction pipe is 1 m and 5 m in delivery pipe. Speed of pump is 1440 rpm. The combined
A hydraulic press has a ram diameter of 250 mm and a plunger diameter of 30 mm. For a force of 40 N applied on the plunger, find the force exerted on the object by the hydraulic press.
A hydraulic press has a plunger diameter 20 mm and the ram diameter 160 mm. The stroke of the plunger is 200 mm, and the weight lifted by the press is 10 kN. The distance travelled by the weight is
In a hydraulic jack, a force of 200 N is applied on the lever having a leverage of 10. If the diameter of ram is 300 mm and that of the plunger 30 mm, determine the weight of the object that can be
A hydraulic jack with a plunger of 30 mm diameter has a stroke of 100 mm, and a ram of 300 mm diameter. A lever arrangement with a leverage of 10 is used to drive the plunger. If a weight of 5 kN is
A hydraulic lift is required to raise a load of 15 kN through a height of 12 m once in every 90 seconds. The lift moves with a velocity of 0.75 m/s. Determine the power required to drive the lift and
The compression ratio of an I.C. engine is defined as(a) Stroke volume (Vs)/Clearance volume (Vc)(b) Vc / Vs (c) Vc + Vs / Vc (d) Vc + Vs / Vs
A four-stroke petrol engine sucks during the suction stroke(a) only air (b) mixture of fuel and air(c) only fuel (d) any one of the above
A four-stroke diesel engine sucks during the suction stroke(a) only air (b) mixture of fuel and air(c) only fuel (d) any one of the above
The value(s) closed during compression stroke of an I.C. engine is/are(a) Inlet (b) Exhaust(c) Both inlet and exhaust (d) none of the above
A two-stroke I.C. engine has(a) inlet and exhaust valves (b) inlet and exhaust ports(c) inlet, exhaust and transfer ports (d) only transfer ports
The ratio of BP to IP is called(a) mechanical efficiency (b) thermal efficiency(c) volumetric efficiency (d) relative efficiency
A 100 c.c. I.C. engine means that its(a) swept volume is 100 c.c. (b) clearance volume is 100 c.c.(c) clearance + swept volume is 100 c.c. (d) swept – clearance volume is 100 c.c.
The ratio of brake power to rate of energy input in fuel is called(a) mechanical efficiency (b) thermal efficiency(c) relative efficiency (d) volumetric efficiency
The ratio of indicated thermal efficiency to air standard efficiency is called(a) volumetric efficiency(b) thermal efficiency(c) mechanical efficiency(d) relative efficiency
The widely used engines for earth-moving machines are :(a) petrol engines(b) steam engines(c) diesel engines(d) gasoline engines
Brake specific fuel consumption of an I.C. engine is(a) \(\frac{\dot{m}_{f}}{B P}\)(b) \(\frac{\dot{m}_{f}}{I P}\)(c) \(\frac{B P}{\dot{m}_{f}}\)(d) \(\dot{m}_{f} \times B P\)
The brake thermal efficiency of modern I.C. engines is(a) \(10-20 \%\)(b) \(25-35 \%\)(c) \(50-60 \%\)(d) \(60-75 \%\)
Which of the following does not relate to spark ignition engine?(a) ignition coil(b) spark plug(c) distributor(d) fuel injector
In a diesel engine, the fuel is ignited by(a) spark(b) injected fuel(c) ignitor(d) compressed air heat
Carburettor is used for(a) S.I. engine(b) C.I. engine(c) Gas engine(d) none of the above
In which engine values are used?(a) Two-stroke engine(b) Four-stroke engine(c) In both engines(d) None of the above
With the same revolutions/minute, the ratio of power developed by 4-stroke engine to that developed by 2 -stroke engine of same bore and stroke is(a) 2(b) 1(c) \(\frac{1}{2}\)(d) 4
The air/fuel ratio in a petrol engine is controlled by(a) governor(b) injector(c) carburettor(d) flywheel
The ratio of stroke to crank radius of an I.C. engine is(a) \(\frac{1}{2}\)(b) 1(c) 2(d) 4
The number of working strokes per minute in case of 4-stroke I.C. engine are(a) \(\mathrm{N} / 2\)(b) \(\mathrm{N}\)(c) \(2 \mathrm{~N}\)(d) \(4 \mathrm{~N}\)where \(\mathrm{N}=\mathrm{rpm}\).
Fuel injector is used in(a) S.I. engine(b) C.I. engine(c) Gas engine(d) Petrol engine
In the case of diesel engine, the fuel and air are mixed in(a) injector(b) inlet manifold(c) carburettor(d) engine cylinder
Which one of the following does not relate to diesel engines ?(a) fuel pump(b) fuel injector(c) governor(d) carburettor
Which one of the following does not relate to petrol engines?(a) ignition coil(b) distributor(c) spark plug(d) fuel injector
The automobiles generally utilise batteries having voltage of(a) \(6 \mathrm{~V}\)(b) \(12 \mathrm{~V}\)(c) \(24 \mathrm{~V}\)(d) \(28 \mathrm{~V}\)
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called(a) net efficiency(b) efficiency ratio(c) relative efficiency(d) overall efficiency
An engine indicator is used to determine(a) speed(b) temperature(c) pressure(d) m.e.p.
Air-fuel ratio in petrol engine is controlled by(a) fuel pump(b) injector(c) controller(d) carburettor
State and describe three major classification of I.C. engines.
Give the advantages of I.C. engines over steam engines.
How do you classify I.C. engines ?
Describe the function of various parts of an I.C. engine.
What are the functions of the following in an I.C. engine ?(a) Piston (b) Crankshaft (c) valve gear mechanism.
Define the following :(a) Clearance volume (b) Swept volume (c) compression ratio
Explain with the help of neat sketches, the working of two stroke petrol engine.
Explain with the help of neat sketches, the working of four stroke diesel engine.
Give the advantages and disadvantages of petrol and diesel engines.
State the advantages of two stroke engines over four stroke engines.
Define the following :(a) Indicated power (b) Brake power (c) Mechanical efficiency(d) Indicated and brake thermal efficiency (e) Relative efficiency
Give the merits and demerits of four-stroke and two-stroke cycle engines.
Explain with the help of neat sketches, the working principle of four stroke petrol engine.
Draw the theoretical and actual p-V diagrams for the following :(a) Four-stroke S.I. engine (b) Four-stroke C.I. engine(c) Two-stroke S.I. engine (d) Two-stroke C.I. engine
Define and explain specific fuel consumption.
List applications of I.C. engines.
Explain the following terms related to I.C. engines :(a) Piston speed (b) Compression ratio(c) Brake power (d) Brake thermal efficiency
Why petrol engines are called S.I. engines and why diesel engines are called C.I. engines.
Explain with neat sketches, the working of two-stroke diesel engine.
Name the various components of an I.C. engine.
The following results refer to a test on a petrol engine, indicated power \(=42 \mathrm{~kW}\)Brake power \(\quad=35 \mathrm{~kW}\)Engine speed \(\quad=1800 \mathrm{rpm}\)Fuel consumed per brake
The following data available for four stroke petrol engine : bore \(=20 \mathrm{~cm}\) stroke to bore ratio \(=\) 1.5, speed \(=350 \mathrm{rpm}, \mathrm{p}_{\mathrm{m}}=2.75 \mathrm{bar}\), net
A four stroke six cylinder engine with stroke volume of 1.75 litres develops \(26.25 \mathrm{~kW}\). The mean effective pressure is 6 bar. Find speed of the engine.
A four cylinder, four stroke diesel engine runs at \(4500 \mathrm{rpm}\). The dead load on rope brake dynamometer is \(200 \mathrm{~N}\) and spring balance reading is \(22 \mathrm{~N}\). The mean
Following data relate to an oil engine working on Otto cycle :Compression ratio \(=6 ;\) B.P. \(=14.8 \mathrm{~kW}\); Suction pressure \(=1\) bar and temp. \(=27^{\circ} \mathrm{C}\); Relative

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